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WO1990006805A1 - Membrane permeable et son procede de fabrication - Google Patents

Membrane permeable et son procede de fabrication Download PDF

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Publication number
WO1990006805A1
WO1990006805A1 PCT/GB1989/001463 GB8901463W WO9006805A1 WO 1990006805 A1 WO1990006805 A1 WO 1990006805A1 GB 8901463 W GB8901463 W GB 8901463W WO 9006805 A1 WO9006805 A1 WO 9006805A1
Authority
WO
WIPO (PCT)
Prior art keywords
process according
polymer
membrane
porous metal
range
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/GB1989/001463
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English (en)
Inventor
Timothy De Villiers Naylor
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BP PLC
Original Assignee
BP PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BP PLC filed Critical BP PLC
Publication of WO1990006805A1 publication Critical patent/WO1990006805A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
    • B01D69/10—Supported membranes; Membrane supports
    • B01D69/106—Membranes in the pores of a support, e.g. polymerized in the pores or voids

Definitions

  • the present invention relates to permeation membranes. It is known to use membranes comprising a polymer layer on a microporous support for various separations making use of differential permeation through the polymer layer which is often termed the "active" layer.
  • No WO 86/00819 discloses a process for the separation of water from a less hydrophilic fluid using a membrane with an active layer of a polymer of an unsaturated organic acid.
  • the active layer is deposited directly on a polysulphone ultra filtration membrane by casting from an aqueous solution of the polymer.
  • EP 146 655 discloses a process in which a polymeric permeation membrane is first cast from an aqueous solution on a glass plate and the resulting membrane is then transferred to a cellulosic filter paper supported on a porous metal disc. It would be desirable to find a method of making permeation membranes from polymers in the form of solutions preferably aqueous solutions which can be directly cast onto supports of high strength and which are resistant to chemical attack, and which give high flux rates of permeate. In particular it is desirable to find a method of casting permeation membranes from polymers in solution onto supports which are more serviceable over a wider range of conditions than polymeric supports and can be reused (by cleaning off the membrane and recasting) .
  • a method of making a permeation membrane characterised in carrying out the successive steps of (i) depositing a coating of a hydrophobic material on a surface of a porous metal structure to give a coated surface,
  • the polymer may optionally be cross-linked.
  • the water-soluble polymer may be any water-soluble polymer which is active as a permeation membrane.
  • An example of a suitable polymer is polyacrylic acid.
  • the polymer is preferably in the form of a salt.
  • examples of other hydrophilic polymers which may be used are polyvinylalcohols, polyacrylates; cellulose esters and polyamides.
  • the porous support may be for example stainless steel.
  • the pores are preferably of substantially uniform size, preferably in the range 20 to 0.01 micrometres, more preferably 10 to 0.1 micrometres.
  • the surface of the porous support on which the active polymer layer is deposited is preferably substantially uniform, without any significant roughness which would prevent a continuous layer being formed.
  • a preferred form of support comprises a non-woven metal felt; sintered metal powder supported on non-woven metal felt may also be used.
  • the sintered metal powder may optionally be supported on a non-metal support.
  • the porous metal structure will be treated with a hydrophobic coating.
  • the hydrophobic coating may be a silicone oil e.g. a dimethyl silicone polymer.
  • PTFE or a hydrocarbon based oil may be used.
  • suitable materials are those sold as mould release agents for moulding organic polymers in steel moulds.
  • a solution of a silicone oil in kerosene may be used.
  • n-octadecyl trimethoxy silane examples include n-2 aminoethyl, 3 aminopropyl trimethoxy silane.
  • the hydrophobic coating may be applied by immersing the porous metal structure in a solution or dispersion of the material. It is generally more economical to apply the material as a spray on the surface of the structure to be treated. Any solvent used is preferably allowed to evaporate before the deposition of the active polymer layer.
  • the active polymer may be conveniently deposited by spreading an aqueous solution of the polymer on the surface if this is a flat surface.
  • a barrier may be placed on the surface to define a known area so as to control the amount of polymer deposited by controlling the weight of polymer in solution introduced into the area within the barrier.
  • the viscosity of the polymer solution is preferably in the range 65 - 300 cPs, more preferably in the range 70 - 100 cPs.
  • a microporous stainless steel filter was treated to render one surface hydrophobic.
  • the stainless steel filter was a sintered product having a nominal pore size cut off of 5 micrometres and was sold under the trade name "Bekipore 5BL2".
  • the surface of the filter was made hydrophobic by spraying on an aerosol dispersion of a solution of a silicone oil in kerosene sold under the trade name "Frekote 1711". The kerosene was allowed to evaporate from the surface of the filter leaving a deposit of silicone oil.
  • the filter was placed on a flat surface with the coated surface uppermost and held flat by means of a stainless steel "0" ring of 80 mm internal diameter.
  • the bottom of the "0" ring was lightly smeared with a silicone high vacuum grease before being placed on the stainless steel filter in order to ensure a water tight seal between the "0" ring and the filter.
  • the hydrophilic polymer used was potassium polyacrylate, which was prepared from polyacrylic acid (M.W. 225,000 ex Aldrich)This was applied as a 0.5% weight solution (calculated on polyacrylic acid) with a pH of 8.5. 12g of the aqueous solution were introduced into the space defined by the "0" ring. The solution was allowed to evaporate to dryness overnight at 20*C. The resulting membrane was used to dehydrate aqueous isopropanol by a pervaporation process.
  • the apparatus used consisted of a stainless steel test cell equipped with a pressure gauge, relief valve, magnetic stirrer and thermometer.
  • the membrane supported on the porous stainless steel disc was sealed into the test cell with rubber "0" rings.
  • the porous support and membrane divided the cell into two portions, an upper portion which was designed to be filled with liquid and a lower portion which was connected to a vacuum pump by way of a trap cooled with liquid nitrogen, in which any vapour permeating the membrane is collected.
  • the cell was heated and agitated by a combined heater and magnetic stirrer.
  • the feed used contained 3% by weight of water and 97% by weight of isopropanol and the cell was maintained at 20 ⁇ C. Under these conditions a pure water flux of 3 kg. ⁇ T ⁇ .day-* and a permeate composition of 99.9% weight water were obtained.
  • Example 2
  • Example 1 was repeated using a feed that contained 3% by weight of water and 97% by weight of isopropanol but the cell was maintained at 80 ⁇ C; under these conditions, a pure water flux of 13.5 kg m ⁇ .da -l and a permeate composition of 99% weight water were obtained.
  • a membrane was prepared as in Example 1 except that in place of the silicone-treated stainless steel filter a polyethersulphone ultra filtration membrane supplied by De Danske Sukkerfabrikker
  • A.S. under the designation GR 40PP was used. This ultra filtration membrane had a nominal molecular weight cut off of 100,000. The quantity of potassium polyacrylate solution deposited within the "0" ring was 2.5g. The membrane was tested as in Example 2.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

Membranes perméables faites à base de couches actives de polymère soluble dans l'eau posées sur un support métallique poreux, par exemple de l'acier inox, que l'on a traité auparavant avec un matériau hydrophobe.
PCT/GB1989/001463 1988-12-16 1989-12-07 Membrane permeable et son procede de fabrication Ceased WO1990006805A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB888829489A GB8829489D0 (en) 1988-12-16 1988-12-16 Permeation membrane and process for making it
GB8829489.7 1988-12-16

Publications (1)

Publication Number Publication Date
WO1990006805A1 true WO1990006805A1 (fr) 1990-06-28

Family

ID=10648670

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1989/001463 Ceased WO1990006805A1 (fr) 1988-12-16 1989-12-07 Membrane permeable et son procede de fabrication

Country Status (5)

Country Link
AU (1) AU4751390A (fr)
CA (1) CA2005650A1 (fr)
GB (1) GB8829489D0 (fr)
WO (1) WO1990006805A1 (fr)
ZA (1) ZA899592B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5275726A (en) * 1992-07-29 1994-01-04 Exxon Research & Engineering Co. Spiral wound element for separation
WO1996002313A1 (fr) * 1994-07-18 1996-02-01 W.L. Gore & Associates, Inc. Stratifie haute temperature, resistant aux attaques chimiques et destine a des systemes de filtration

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1301799A (fr) * 1960-09-28 1962-08-17 Millipore Filter Corp Filtre à cartouche perfectionné
US3367787A (en) * 1963-01-25 1968-02-06 Henricus Alexis Cornelis Thijs Evaporation concentration of liquids
FR1531810A (fr) * 1966-07-07 1968-07-05 Dorr Oliver Inc Dispositifs de séparation à membranes, et procédé et appareil pour leur fabrication
JPS59112802A (ja) * 1982-12-17 1984-06-29 Matsushita Electric Ind Co Ltd 選択気体透過性複合膜
WO1986000819A1 (fr) * 1984-07-27 1986-02-13 The British Petroleum Company P.L.C. Separation de l'eau des fluides organiques
EP0280945A2 (fr) * 1987-03-05 1988-09-07 Akzo N.V. Procédé de fabrication d'une membrane à deux couches
JPS63287504A (ja) * 1987-05-19 1988-11-24 Ngk Insulators Ltd 分離膜
EP0320033A1 (fr) * 1987-11-19 1989-06-14 Hoogovens Groep B.V. Membrane composite céramique microperméable, procédé et appareil pour sa fabrication

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1301799A (fr) * 1960-09-28 1962-08-17 Millipore Filter Corp Filtre à cartouche perfectionné
US3367787A (en) * 1963-01-25 1968-02-06 Henricus Alexis Cornelis Thijs Evaporation concentration of liquids
FR1531810A (fr) * 1966-07-07 1968-07-05 Dorr Oliver Inc Dispositifs de séparation à membranes, et procédé et appareil pour leur fabrication
JPS59112802A (ja) * 1982-12-17 1984-06-29 Matsushita Electric Ind Co Ltd 選択気体透過性複合膜
WO1986000819A1 (fr) * 1984-07-27 1986-02-13 The British Petroleum Company P.L.C. Separation de l'eau des fluides organiques
EP0280945A2 (fr) * 1987-03-05 1988-09-07 Akzo N.V. Procédé de fabrication d'une membrane à deux couches
JPS63287504A (ja) * 1987-05-19 1988-11-24 Ngk Insulators Ltd 分離膜
EP0320033A1 (fr) * 1987-11-19 1989-06-14 Hoogovens Groep B.V. Membrane composite céramique microperméable, procédé et appareil pour sa fabrication

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Volume 8, No. 225 (C-247) (1662), 16 October 1984; & JP-A-59112802 (Matsushita Denki Sangyo K.K.) 29 June 1984 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5275726A (en) * 1992-07-29 1994-01-04 Exxon Research & Engineering Co. Spiral wound element for separation
WO1996002313A1 (fr) * 1994-07-18 1996-02-01 W.L. Gore & Associates, Inc. Stratifie haute temperature, resistant aux attaques chimiques et destine a des systemes de filtration
AU675168B2 (en) * 1994-07-18 1997-01-23 W.L. Gore & Associates, Inc. High temperature, chemical resistant filtration laminate

Also Published As

Publication number Publication date
GB8829489D0 (en) 1989-02-01
ZA899592B (en) 1991-08-28
CA2005650A1 (fr) 1990-06-16
AU4751390A (en) 1990-07-10

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